South Korea has an unexpected new hit movie: the story of factory workers who became ill working for a company that looks a lot like the Korean giant Samsung

South Korea has an unexpected new hit movie: the story of factory workers who became ill working for a company that looks a lot like the Korean giant Samsung. The makers of "Another Family"—the second-highest-grossing film to debut in South Korea last week—say it is based on the true story of a working-class family whose daughter contracted leukemia while working at a Samsung semiconductor factory and died of the disease in 2007.

Four years later, the Seoul Administrative Court ruled that toxic chemicals at the...